diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 46c434c..9aa4273 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -2,5 +2,6 @@
 
 require_once dirname(__FILE__) . '/../session/Session.php';
 
+ob_start();
 Session::start();
 ?>